MEAN 400错误请求

Question

so I'm posting this question after a hours of research .... That's the answer of the browser and I can't find any reason why... So, after the login, I want to fetch the score of the user logged. The score is located in a subtable of the user table (Mongo ...). But the call for the server doesn't work. Here is my code :

login.component.ts

this.dbService.scoresDownload(this.username).subscribe(scoresDownload => {
                console.log(scoresDownload);
              });

db.service.ts

  scoresDownload(username) {
this.createAuthenticationHeaders();
console.log(username)
return this.http.post(this.domain + 'training/scoresDownload', username, this.options).map(res => res.json());

}

training.js (route in Express)

          router.post('/scoresDownload', (req, res) => {

// let wordScoresDb = [];
console.log(req)

User.find({}, (err, result) => {
  if (err) {
    res.json({ success: false, message: err }); // Return connection error
  } else {
    res.json({ success: true, message: result }); // Return as vailable username
  }
})});

It works well if I use a get instead of a post .... And the most tricky part is that it works with all my other calls. So, I really don't know where I mess up ... Cheers guys !

EDIT : I forgot to mention the error sent by express

SyntaxError: Unexpected token # in JSON at position 0
at Object.parse (native)
at createStrictSyntaxError (D:\Code\Deutsch_App_MEAN\node_modules\body-parser\lib\types\json.js:157:10)
at parse (D:\Code\Deutsch_App_MEAN\node_modules\body-parser\lib\types\json.js:83:15)
at D:\Code\Deutsch_App_MEAN\node_modules\body-parser\lib\read.js:121:18
at invokeCallback (D:\Code\Deutsch_App_MEAN\node_modules\raw-body\index.js:224:16)
at done (D:\Code\Deutsch_App_MEAN\node_modules\raw-body\index.js:213:7)
at IncomingMessage.onEnd (D:\Code\Deutsch_App_MEAN\node_modules\raw-body\index.js:273:7)
at emitNone (events.js:86:13)
at IncomingMessage.emit (events.js:185:7)
at endReadableNT (_stream_readable.js:974:12)
at _combinedTickCallback (internal/process/next_tick.js:80:11)
at process._tickCallback (internal/process/next_tick.js:104:9)

Answer 1

好吧...我很痛苦地找到了答案...我通过MEAN传递的用户名是一个字符串...显然，来自http模块的“ post”仅接受对象或数组，而不接受字符串...Voilà:)